Relationships among Preparative Technique,Phase Composition and Bending Strength of Bauxite Porcelain |
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| Authors: | REN Qiang WU Xiu-Lan HE Xuan-Meng ZHU Zhen-Feng |
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| Affiliation: | School of Material Science and Engineering,Shaanxi University of Science and Technology, Xianyang 712081, China |
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| Abstract: | Bauxite porcelain can be sintered to make its bending strength reach 179Mpa by using sintered bauxite,clay and potash feldspar and albite as the main raw materials in oxidation atmosphere under the normal pressure.XRD,SEM and so on are utilized to study the relationships between factors like the composition of ingot,reduction particle size and heat insulating time at sintering temperature and the phase composition,microstructure and bending strength of ceramic body.The results show that the main phases in bauxite porcelain are corundum,mullite and glass,and the mullite is composed of two parts:primary mullite formed by clay conversion and secondary mullite whiskers precipitating from high temperature melt.The bending strength of ceramic body can be improved by enhancing the content of sintered bauxite in the formula:the smaller the particle size of the ceramic body is,the higher the bending strength will be.The high-temperature heat insulating technique is beneficial to the precipitation of certain quantitative secondary mullite whiskers so as to remarkably improve the strength of glass phase and ceramic body. |
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| Keywords: | bauxite porcelain microstructure mullite whiskers bending strength Technique Relationships Porcelain Bauxite Bending Strength Composition technique precipitation quantitative improved strength glass phase content formula primary conversion secondary whiskers high temperature melt |
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